BUG: Fix Issue when loading attribute resource from file
- Issues was that ReferenceItem was not calling resolve when doing a find
- Instead, this change uses the item's interators (which do call resolve) in the find methods
- Implemented a work around that caused issues in ModelBuilder when unloading a model resource whose components where being referenced in an attribute resource. Prior to this fix, the associated components were no longer being displayed.
- Changed the constriant test to check that this fixes this issue
See Issue #244 (closed)